矽力杰SY7304

Features
• • • • • • • • • • Wide input range: 3-33V Maximum output voltage: 33V 1MHz switching frequency Integrated 120 mΩ RDS(ON) switch with 4A peak current capability Internal soft-start 0.6V±2% reference voltage Cycle by cycle peak current limit Over temperature protection RoHS Compliant and Halogen Free Compact package: DFN3×3-10
Ordering Information
SY7304□(□□)□ Tempera ture Code Packa ge Code Optiona l Spec Code
Applications
Note 4A • Portable Device • Battery Powered System • Networking cards powered from PCI or PCIexpress slots
Symbol VIN IQ ISHDN RDS(ON) ILIM Fsw VREF IFB VIN,UVLO UVLO,HYS VENH VENL Dmax TSD THYS
Test Conditions VFB=0.66V EN=0
Min 3
Typ 100
Max 33 15
120 Duty cycle=80% 4 0.8 0.588 -50 0.1 2 0.4 90 150 15 1 0.6 6 1.2 0.612 50 2.7
Absolute Maximum Ratings (Note 1)
LX, IN, EN -------------------------------------------------------------------------------------------------------- -0.3V to 36V FB -------------------------- ----------------------------------------------------------------------------------------- -0.3V to 4V Power Dissipation, PD @ TA = 25°C DFN3×3-10---------------------------------------------------------------------2.6W Package Thermal Resistance (Note 2) θ JA -------------------------------------------------------------------------------------------------------------38°C/W θ JC ------------------------------------------------------------------------------------------------------------- 8°C/W Junction Temperature Range ---------------------------------------------------------------------------------- -40 to 150°C Lead Temperature (Soldering, 10 sec.) ------------------------------------------------------------------------------- 260°C Storage Temperature Range -------------------------------------------------------------------------------- -65°C to 150°C Dynamic LX voltage in 50ns duration ----------------------------------------------------------------- IN+3V to GND-4V
Ordering Number SY7304DBC
Package type DFN3×3-10
Typical Applications
Figure 1. Schematic Diagram
Figure 2. Efficiency vs. Load Current
AN_SY7304 Rev. 0.9
Silergy Corp. Confidential- Prepared for Customer Use Only
Recommended Operating Conditions (Note 3)
IN ----------------------------------------------------------------------------------------------------------------------- 3V to 33V Junction Temperature Range ---------------------------------------------------------------------------------- -40°C to 125°C Ambient Temperature Range ----------------------------------------------------------------------------------- -40°C to 85°C
Unit V µA µA mΩ A MHz V nA V V V V % °C °C
Note 1: Stresses listed as the above “Absolute Maximum Ratings” may cause permanent damage to the device. These are for stress ratings. Functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may remain possibility to affect device reliability. Note 2: θ JA is measured in the natural convection at TA = 25°C on a low effective single layer thermal conductivity test board of JEDEC 51-3 thermal measurement standard. Test condition: Device mounted on 2” x 2” FR-4 substrate PCB, 2oz copper, with minimum recommended pad on top layer and thermal vias to bottom layer ground plane. Note 3: The device is not guaranteed to function outside its operating conditions.
Applications Note:SY7304
High Efficiency 33V, 4A, 1MHz Step Up Regulator
General Description
The SY7304 is a high efficiency, current-mode control Boost regulator. The device integrates a 120mΩ low RDS(ON) N-channel MOSFET for high efficiency. The fixed 1MHz switching frequency and internal compensation reduce external components size and count. The build-in internal soft start circuitry minimizes the inrush current at start-up. The SY7304 is available in compact DFN3×3-10 package.
AN_SY7304 Rev0.9
Silergy Corp. Confidential- Prepared for Internal Use Only
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Block Diagram
AN_SY7304 Rev0.9
Silergy Corp. Confidential- Prepared for Internal Use Only
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SY7304
Electrical Characteristics
(VIN = 5V, VOUT=12V, IOUT=100mA, TA = 25°C unless otherwise specified)